36 lines
1 KiB
Go
36 lines
1 KiB
Go
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package discovery
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import (
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"errors"
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"time"
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)
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var (
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// ErrNotSupported is returned when a discovery service is not supported.
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ErrNotSupported = errors.New("discovery service not supported")
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// ErrNotImplemented is returned when discovery feature is not implemented
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// by discovery backend.
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ErrNotImplemented = errors.New("not implemented in this discovery service")
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)
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// Watcher provides watching over a cluster for nodes joining and leaving.
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type Watcher interface {
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// Watch the discovery for entry changes.
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// Returns a channel that will receive changes or an error.
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// Providing a non-nil stopCh can be used to stop watching.
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Watch(stopCh <-chan struct{}) (<-chan Entries, <-chan error)
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}
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// Backend is implemented by discovery backends which manage cluster entries.
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type Backend interface {
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// Watcher must be provided by every backend.
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Watcher
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// Initialize the discovery with URIs, a heartbeat and a ttl.
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Initialize(string, time.Duration, time.Duration) error
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// Register to the discovery.
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Register(string) error
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}
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